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| Titel |
A sea-ice thickness retrieval model for 1.4 GHz radiometry and application to airborne measurements over low salinity sea-ice |
| VerfasserIn |
L. Kaleschke, N. Maaß, C. Haas, S. Hendricks, G. Heygster, R. T. Tonboe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 4, no. 4 ; Nr. 4, no. 4 (2010-12-13), S.583-592 |
| Datensatznummer |
250001906
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| Publikation (Nr.) |
 copernicus.org/tc-4-583-2010.pdf |
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| Zusammenfassung |
In preparation for the European Space Agency's (ESA) Soil Moisture
and Ocean Salinity (SMOS) mission, we investigated the potential of
L-band (1.4 GHz) radiometry to measure sea-ice thickness.
Sea-ice brightness temperature was measured at 1.4 GHz and ice
thickness was measured along nearly coincident flight tracks during
the SMOS Sea-Ice campaign in the Bay of Bothnia in March 2007. A
research aircraft was equipped with the L-band Radiometer EMIRAD and
coordinated with helicopter based electromagnetic induction (EM) ice
thickness measurements.
We developed a three layer (ocean-ice-atmosphere) dielectric slab model for
the calculation of ice thickness from brightness temperature. The dielectric
properties depend on the relative brine volume which is a function of the
bulk ice salinity and temperature.
The model calculations suggest a thickness sensitivity of up to
1.5 m for low-salinity (multi-year or brackish) sea-ice. For Arctic
first year ice the modelled thickness sensitivity is less than half
a meter. It reduces to a few centimeters for temperatures
approaching the melting point.
The campaign was conducted under unfavorable melting conditions and
the spatial overlap between the L-band and EM-measurements was
relatively small. Despite these disadvantageous conditions we
demonstrate the possibility to measure the sea-ice thickness with
the certain limitation up to 1.5 m.
The ice thickness derived from SMOS measurements would be
complementary to ESA's CryoSat-2 mission in terms of the error
characteristics and the spatiotemporal coverage. The relative error
for the SMOS ice thickness retrieval is expected to be not less than
about 20%. |
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